A particle which is moving due east at 4m/s changes direction and starts to move due south at 3m/s. Find the change in velocity, by graphing methods​

Ben (55kg) is standing on very slippery ice when junior (25kg) bumps into him. junior was moving at a speed of 8 m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision. give the answer in m/s. describe the work you did to get the answer.